1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
var arrayMap = require('./_arrayMap'),    baseIntersection = require('./_baseIntersection'),    baseIteratee = require('./_baseIteratee'),    baseRest = require('./_baseRest'),    castArrayLikeObject = require('./_castArrayLikeObject'),    last = require('./last');
/** * This method is like `_.intersection` except that it accepts `iteratee` * which is invoked for each element of each `arrays` to generate the criterion * by which they're compared. The order and references of result values are * determined by the first array. The iteratee is invoked with one argument: * (value). * * @static * @memberOf _ * @since 4.0.0 * @category Array * @param {...Array} [arrays] The arrays to inspect. * @param {Function} [iteratee=_.identity] The iteratee invoked per element. * @returns {Array} Returns the new array of intersecting values. * @example * * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor); * // => [2.1] * * // The `_.property` iteratee shorthand. * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); * // => [{ 'x': 1 }] */var intersectionBy = baseRest(function(arrays) {  var iteratee = last(arrays),      mapped = arrayMap(arrays, castArrayLikeObject);
  if (iteratee === last(mapped)) {    iteratee = undefined;  } else {    mapped.pop();  }  return (mapped.length && mapped[0] === arrays[0])    ? baseIntersection(mapped, baseIteratee(iteratee, 2))    : [];});
module.exports = intersectionBy;